1851358148644 has 6 divisors (see below), whose sum is σ = 3239876760134. Its totient is φ = 925679074320.

The previous prime is 1851358148561. The next prime is 1851358148671. The reversal of 1851358148644 is 4468418531581.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1203474820900 + 647883327744 = 1097030^2 + 804912^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 231419768577 + ... + 231419768584.

Almost surely, 2^{1851358148644} is an apocalyptic number.

It is an amenable number.

1851358148644 is a deficient number, since it is larger than the sum of its proper divisors (1388518611490).

1851358148644 is a wasteful number, since it uses less digits than its factorization.

1851358148644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462839537165 (or 462839537163 counting only the distinct ones).

The product of its digits is 14745600, while the sum is 58.

It can be divided in two parts, 1851358 and 148644, that added together give a palindrome (2000002).

The spelling of 1851358148644 in words is "one trillion, eight hundred fifty-one billion, three hundred fifty-eight million, one hundred forty-eight thousand, six hundred forty-four".